Electromagnetic control of pneumatic door-motors.



T. FARMER, JR. ELEGTHOMAGEgl-TTIG CONTROL OF PNEUMATIC DOOR MOTORS.

APPLICATION FILED JUNE 1, 1912.

Patented 0@t.14,1913.

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WETNESSES: iv INVENTOR 6Z1. d igzzw f wiizwfikrmrjh,

h BY 4 if, NEW "KG- THOMAS FARMEIEQ, 5321.. 61? A 11 "nil ASEEGQTQEI TD, EQNSOLIDATED GAE? ELECTEQE Z Application 111cc June 1,

To a??? whommay concern Be it known that I, Ti-zooms 612, a citizen of the United Slates. residing at Albany, county of Albany, State of New York, have invented certain new (Lil i useful Emprovemenis in Electromagnetic Control of oeumatic Door-Motors; the following beingfull; cleans, e116: execs ilisclosui'e 'jlie one form of my invention avl'iich l at present clecm gei'eieiebl'e.

For a cleteilecl iescription of She present form of my invention, reference he lied to the following specification and lo the aceoinpsnying drawings, which illostz'eie my 111v on WlY' GlZi l 1 my invention (liegrammatically; H ig. 2 en section of lie v ve.

l entice rel. ice contvcl. of e reclprocetin pneumeeic (100. motor in such a way aim; the 61cc? be either opened or closeci and eiifiiiei condition t oe 'moim: left for indefinite peicioel Wlilll the pressure on the electric circuit closed, while by breaking the electric circuit elie motor will be left in a neutral condition with air pressure balanced so that the doo can be moved, by lmncl. this IHQRyZlScfilSO ilie 6360?, can advanced in ei'zher direction step i337 seep, my arsengement l provicie e clouiole Feeling ylinder motor, each encl of which is provf ed a separate spring:- closel valve which merely eclmits air #10 she cylinder or, on she other hencl, exhausts the cylinder to tie ei niospliere. For each sepmete valve 1' provii'ie an iniiiviclusl electromegnet, of special construction to enable it 60 remain inElefinic-elg' enclosed-circles flihi tile swiieh-eensrol cf these magnets is such that, when the circuii of a magnet is closed, valve will be openec? against the fame of elcsing springin a eosision so to M13 cofzesponclieg cylinder. This pic.

coisis always closed through one magnet or ilie other excepe the particular instants when the {floor is started lowercl the opposite end 01" iize muse 0i. seoppecl in his ioievel end leii; neutral. Y

Eefe r ng 51o allie cleevviiio A represents e priests! ole elem motor 031 liiili new Wail Emowe in oiectice anal its construction,

"so i" l meseioe fapecification 01? Letters Serial l fe. wees-i.

are movecl from iiglii; to left (so open the (zoo -y ecl'mission of an pressure so K neiicl endv cylincler i, the in.-

ncler cluring; each movemeo-l being open 0 the atmosphere through the same pipe admits pressure therelzo when ii. is

serves "no llfi docs-closing movementc vile 1* cylinder 9 serves to deecien the do r-opening movement.

tile control valve for cylin- 1, soil B represents a similar valve in section) for cylincler 2. The 2e has a recess 28 at its top which communicates will: the atmosphere through exlseusi duct 27 eml also a control chamber which COETIHIHIRlCRiZQS Wish the pipe 12 to the left hand end of cylin- (ler z. also ccnteins a lower recess 24 closecl by pei-fci'olefl nut 2*1 through which lslie enters 12 mm supply pipe 13 by Way of the branch 14%. The top anci ecilcm recesses iioi'ih communiceage Wish she control clism'ber e3 e vertical cuct through which the stem 955 of like puppei valve that controls ice comz'oe eicesion of the 24 with seicl control cliemoer. f limileiily the communication oi the upper recess with seicl control chamber is controlled by EOfl 32 she lower c2163. of which lies a cenieel form to serve as e valve.- The seem 25 e ivsers a central lielein the lower end of red 32 While the puppet valve 26 is lin wenlly pressefi: up e einst its seen: by efpit'ing 1v cylinder. A. dash-poficylincler l0 external magnetic shell 30. The shell 30 is surrounded by a screw cap 35 and a space is left under this cap for an armature disk 36 pressed upward by a spring 37. From the center of the armature disk the nonmagnetic rod 32 passes down through an axial perforation in core and is tormed as aforesaid, with a conical end serving as a .valve. A magnet of this description can remain indefinitely on closed circuit without terminate at the respective contacts 42 and 43 of the switch E. The movement of blade 41 to the left will energize magnet C through contact- 42 and its reverse move.- ment to the right will energize magnet C thriugh contact 43, as shown in the drawing, while either magnet may be deenergizcd by moving the blade away from the corresponding contact 42 or 43 without energizing the opposite magnet.

The operation is as follows: To close door D, move blade 41 to contact 43. This energizes magnet G which draws down its ar mature disk 36 against the force of spring 37. The armature forces down the rod 32 which strikes the upper end of stem 25a slight blow, knocking the puppet valve 26 off its seat against the force of spring 22, and then by a further movement closes the passage from the control chamber to the recess 28 and exhaust duct 27. Thereupon air flows from supply pipe 13, through branch 14-, recess 2st, control chamber 523 to the rear end of cylinder 2 which then acts to drive crossheads 5 and 6 together .with door D to the right to close it. The doorcan be instantly stopped at any point in its course by moving blade 41 away from contact 43 and so can be advanced to its closing position step by step, or it may be left at any point with both cylinders exhausted and the pressure on the piston thereby equalized,

so that the door will be left free to be workedin an extreme position, either opened or closed, thereby avoiding the need of latches or locks and at the same time the circuit will remain closed through oneinagnet or the other. It may be added that this closed circuit condition is 'made practicable by the special construction of the magnetic valve as above described, the magnet of which re quires but an infinitesimal amount oi current to operate it and maintain it after operation.

What I claim as new and desire to secure by Letters Patent is: i p

1. A doubleacting fluid pressure door operating device comprising a motor, a source of fluid pressure having branches communicating with each end of the motor, a magnetic valve controlling each branch and provided with an exhaust, and an electric circuit including the valves and a controlling switch having separate contacts connected with the respective valves, and an independent contact connected with both valves whereby one valve may be open to exhaust and'the other valve closed to exhaust but open to admit pressure to the jpiotor, or the circuit opened to place both alves in position to exhaust.

2. A double acting fluid pressure door operating device comprising a motor, a source of pressure supply connected to each end of the motor, separate valves controlling the admission or" pressure to the ends of the motor and provided with exhausts, and an electric circuit including the valves and a controlling switch having separate contacts connected with the respective valves, and an independent contact connected with both valves whereby one valve may beopen to admit pressure to one end of the motor and the other valve open to exhaust, or both valves open to exhaust.

3. A double acting door motor comprisin a fluid pressure'motor, separate means c0nend thereof and provided with pressure exhausts, and an electric circuit including said controlling means, and a switch having separate contacts connected with the respective valves, and an independent contact connected with both valves whereby, the pressure 'may be independently admitted to either end of the motor, or the controlling means placed at the exhaust to prevent pressure being admitted to the motor.

4:. Ina double acting door operating de vice, the combination with a fluid ressure motor, a source of pressure supply or each end thereof, separate valves controlling the admission ofpressure to the ends of the to exhaust.

5. In a double acting door operating device, the combination with a fluid pressure motor, and provided with exhausts, and ancontrolling switch having separate conand an independent cont-act connected withtrolling the admission of pressure to each 3 to admit pressure to the motor and the other motor, and a source of pressure supply for motor and the other opened to exhaust, or 15 each end thereof, of-a separate valve for conboth valves opened to exhaust to permit trolling the admission of pressure to each manual operation of the doors. end of the motor and 'for exhausting the In witness whereof I have hereunto set my 5 pressure, and an electric circuit including hand, before two subscribing witnesses, this the valves and a controlling switch having 25th day of May, 1912.

separate contacts connected with the respec- THOMAS FARMER, JR. tive valves, and an independent contact con- Witnesses: nected with both valves whereby one valve RUssELL BUNoE,

10 may be opened to admit pressure to the FRANK DANNHAUSER. 

